Answers

maybe they're too thin.. so when it's cold, they're like a window with thin glass practically! There are some products, I think they're called nail hardeners! try search for some I knew I had that and it really helped me :D

well you have to trim them from time to time and as davie said sally hanson manicure is extremely good i tried it ! and also you can soak them in olive oil - lemon - for 10 mins , and i am positively sure there will be a difference :)